广州3TB40010XG1西门子接触器经销商 3TB39100XN2

直流电流与交流电流相比较，不存在周期性的电流数值过零点，因此，传统接触器开断电路时，触头之间产生的电弧较为强烈，燃弧时间也比较长，以便充分释放电路中剩余的能量。电弧的燃烧产生高温和强光，对触头表面有严重的烧蚀作用，触头材料在多次开断之后逐渐流失，触头电磨损严重时，导致直流接触器报废，不能开断电路。 [1] 
电力电子技术得以迅猛发展，人们将电力电子元件应用到直流接触器中，巧妙的创造出一种混合式直流接触器，使得直流接触器向智能化、可控化迈进了新的一步。这种混合式接触器利用传统直流接触器在闭合导通状态下触头接触电阻小、导通压降小的优点，将由反并联晶闸管和控制模块单元共同组成的无触点开关并联在传统直流接触器触头上。这种无触点的电力电子开关分断电路时不产生电弧，这就避免了传统接触器中电弧对触头材料的电磨损，也就大大增加了触头的使用寿命和可靠性。 [1] 
直流接触器永磁机构
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另一半是活动铁芯，构造和固定铁芯一样，用以带动主接点和接点的闭合断开。
20A以上的接触器加有灭弧罩，利用电路断开时产生的电磁力，快速拉断电弧，保护接点。
接触器可高频率操作，做为电源开启与切断控制时﹐高操作频率可达每小时1200次。
接触器的使用寿命很高，机械寿命通常为数百万次至一千万次，电寿命一般则为数十万次至数百万次。
技术发展
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半导体接触器：半导体接触器是一种通过改变电路回路的导通状态和断路状态而完成电流操作的接触器。
永磁接触器：永磁交流接触器是利用磁极的同性相斥、相吸的原理，用永磁驱动机构取代传统的电磁铁驱动机构而形成的一种微功耗接触器。
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